<template>
  <div>
    <div>
      <!-- 面包屑导航区 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图区域 -->
      <el-card>
        <!-- 头部警告区域 -->
        <el-alert
          title="注意，只允许为第三级分类设置相关参数"
          type="warning"
          show-icon
        >
        </el-alert>
        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
          <el-col>
            <sapn>选择商品的分类：</sapn>
            <!-- 选择商品分类的级联选择框 -->
            <el-cascader
              v-model="selectedCateKeys"
              :options="catelist"
              :props="cateProps"
              expandTrigger="hover"
              @change="handleChange"
              clearable
            ></el-cascader>
          </el-col>
        </el-row>

        <!-- tab 页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleClick">
          <!-- 添加动态参数的面板 -->
          <el-tab-pane label="动态参数" name="many">
            <!-- 添加参数的按钮 -->
            <el-button
              type="primary"
              size="mini"
              :disabled="isBtnDisabled"
              @click="addDialogVisible = true"
              >添加参数</el-button
            >
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染tag 标签 -->
                  <el-tag
                    v-for="(item, i) in scope.row.attr_vals"
                    :key="i"
                    closable
                    @close="handleClose(i,scope.row)"
                  >
                    {{ item }}
                  </el-tag>
                  <!-- 输入文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加的按钮 -->
                  <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)"
                    >+ New Tag</el-button
                  >
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column
                label="参数名称"
                prop="attr_name"
              ></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button
                    type="primary"
                    icon="el-icon-edit"
                    size="mini"
                    @click="showEditDialog(scope.row.attr_id)"
                    >编辑</el-button
                  >
                  <el-button
                    type="danger"
                    icon="el-icon-delete"
                    size="mini"
                    @click="removeParams(scope.row.attr_id)"
                    >删除</el-button
                  >
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!-- 添加静态属性的面板 -->
          <el-tab-pane label="静态属性" name="only">
            <!-- 添加属性的按钮 -->
            <el-button
              type="primary"
              size="mini"
              :disabled="isBtnDisabled"
              @click="addDialogVisible = true"
              >添加属性</el-button
            >
            <!-- 静态属性表格 -->
            <el-table :data="onlyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染tag 标签 -->
                  <el-tag
                    v-for="(item, i) in scope.row.attr_vals"
                    :key="i"
                    closable
                    @close="handleClose(i,scope.row)"
                  >
                    {{ item }}
                  </el-tag>
                  <!-- 输入文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加的按钮 -->
                  <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)"
                    >+ New Tag</el-button
                  >
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column
                label="属性名称"
                prop="attr_name"
              ></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button
                    type="primary"
                    icon="el-icon-edit"
                    size="mini"
                    @click="showEditDialog(scope.row.attr_id)"
                    >编辑</el-button
                  >
                  <el-button
                    type="danger"
                    icon="el-icon-delete"
                    size="mini"
                    @click="removeParams(scope.row.attr_id)"
                    >删除</el-button
                  >
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
      <!-- 添加参数的对话框 -->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed"
      >
        <!-- 添加参数的对话框 -->
        <el-form
          :model="addForm"
          :rules="addFormRules"
          ref="addFormRef"
          label-width="100px"
        >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input> </el-form-item
        ></el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
      <!-- 修改参数的对话框 -->
      <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed"
      >
        <!-- 修改参数的对话框 -->
        <el-form
          :model="editForm"
          :rules="editFormRules"
          ref="editFormRef"
          label-width="100px"
        >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input> </el-form-item
        ></el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </div>
  </div>
</template>

<script>
export default {
  data: function () {
    return {
      // 商品分类列表
      catelist: [],
      //   级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {},
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //   控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.catelist = res.data;
      console.log(this.catelist);
    },
    // 级联选择框选中项变化，会触发这个函数
    async handleChange() {
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData=[]
        this.onlyTableData=[]
        return;
      }
      //证明选中的是三级分类
      console.log(this.selectedCateKeys);
      // 根据所选分类的id 和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败");
      }

      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []
        // 控制文本框的显示与隐藏
        item.inputVisible=false
        // 文本框中输入的值
        item.inputValue=''
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    // tab 页签点击事件的处理函数
    handleClick() {
      this.getParamsData();
      console.log(this.activeName);
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败");
        }
        this.$message.success("修改参数成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据 id 删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      // 用户取消删除操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除操作");
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败");
      }
      this.$message.success("删除参数成功");
      this.getParamsData();
    },
    // 文本框失去焦点或按下enter间都会触发
    async handleInputConfirm(row){
        if(row.inputValue.trim().length===0){
            row.inputValue=''
            row.inputVisible=false
            return
        }
        // 如果没有 return ，则证明输入了内容，需要做后续的处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible=false
        // 需要发起请求，保存这次操作
        const{data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,attr_sel:row.attr_sel,attr_vals:row.attr_vals.join(' ')
        })
        if(res.meta.status!==200){
            return this.$message.error("修改参数项失败");
        }
         this.$message.success("修改参数项成功");
    },
    // 将对attr_vals的操作，保存到数据库
    async saveAttrVals(row){
        // 需要发起请求，保存这次操作
        const{data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,attr_sel:row.attr_sel,attr_vals:row.attr_vals.join(' ')
        })
        if(res.meta.status!==200){
            return this.$message.error("修改参数项失败");
        }
         this.$message.success("修改参数项成功");
    },
    // 点击按钮，显示文本输入框
    showInput(row){
        row.inputVisible=true
        // 让文本框自动获得焦点
        // $nextTick 方法的左右，就是当页面上元素被重新渲染后，才会指定回调函数中的代码
         this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除对应的参数可选项
    handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true ,否则返回 false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    //   当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>

<style scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px;
}
.input-new-tag{
    width:120px
}
</style>